Publications on the project |
041 Nanocomposites Derived from Polyoxometalate Complexes of Copper(II) and Nickel(II) with Au(0) |
Authors: | A. V. Barna, Ya. D. Lampeka | |
Summary: | A heterophase interaction of reduced polyoxometalate (POM) compounds containing copper(II) and nickel(II) amine complexes as the cationic component with aqueous solutions of H[AuCl4] is accompanied by adsorption of the tetrachloroaurate anion by the POM matrix and leads to the formation of products containing nanoparticles of metallic gold. The concentrations of the components and nature of the reducing agent significantly affect the structure of the composites formed. | |
Keywords: | | |
Edition: | Theoretical and Experimental Chemistry | | | 2013,
323-327,Russian |
041 Factors determining the formation of silver nanoparticles in the heterophase reduction OF Ag(I) |
Authors: | A. V. Barna, Ya. D. Lampeka | |
Summary: | It was shown that by varying the preparative conditions for the redox reactions between the phosphomolybdate complex of copper and an aqueous solution of silver(I) nitrate (the reaction time, the concentration of the metal salt, ultrasonic treatment) it is possible to control the content of the metal and the dispersion of its nanoparticles in composite materials containing silver nanoclusters and polyoxometalates. | |
Keywords: | | |
Edition: | | | | 2012,
224-229,Russian |
041 Multi-walled carbon nanotubes with the pyridine-containing fragment and copper(II) ions |
Authors: | Zharikova, E.F., Ochertyanova, L.I., Vasylenko, I.V., Gontar, I.V., Efimov, N.N., Minin, V.V., Dobrokhotova, Z.V., Kiskin, M.A., Novotortsev, V.M., Eremenko, I.L. | |
Summary: | Modified multi-walled carbon nanotubes (MWNT)-CO-L (L = NHCH 2C5H4N) were synthesized. The possibility of their interaction with magnetically active binuclear complex Cu 2(Piv)4(HPiv)2 was shown. The presence of copper(ii) ions on the surface of the reaction product, {Cu}@MWNT-CO-L, was suggested and confirmed by the data of thermogravimetry combined with mass spectral analysis, ESR spectroscopy, atomic absorption spectrophotometry, and electron microscopy (TEM and SEM) | |
Keywords: | copper(ii) coordination compound; ESR spectroscopy; mass spectral analysis; multi-walled carbon nanotubes; MWNT surface functionalization; thermogravimetry | |
Edition: | Russian Chemical Bulletin | | | 2012,
1415-1421,Russian |
041 Highly acidic phosphorus-containing porous carbons: synthesis and physicochemical properties |
Authors: | Nataliya D. Lysenko, Pavel S. Yaremov, Mariya V. Ovcharova, Vladimir G. Ilyin | |
Summary: | Phosphorus-containing carbon porous materials
were obtained by pyrolysis of sucrose in the presence of
phosphoric acid at a temperature 400 and 800 C. Synthesized
samples were characterized by elemental analysis,
infrared spectroscopy, nitrogen adsorption–desorption, the
measurement of cation-exchange capacity (CEC) and
sorption capacity for lead ions, potentiometric titration. It
was shown that phosphorus-containing carbon sorbents
have acidic properties and they are characterized by high
cation-exchange capacity (up to 5.9 mmol/g). The samples
which were synthesized at 800 C have the highest content
of acid groups, as well as phosphorus and oxygen. Detected
surface acidic groups are phosphorus-containing (pR *
1.7–1.9) and represent residua of acid phosphates and
polyphosphates, connected with carbon framework. High
CEC of synthesized materials can be attributed to a significant
degree of phosphorylation of sucrose through the
large number of hydroxyl groups. P-containing acid groups
on the surface of carbon framework provide high adsorption
of heavy metals ions (in particular lead). Thus, the
obtained P-containing carbon sorbents can be used as
effective cation-exchangers for the removal of cations of
heavy metals from aqueous solutions.
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Keywords: | | |
Edition: | J. of Materials Science | | | 2012,
3089-3095,English |
041 Size-dependent photoinduced interactions between ZnO nanocrystals and a nitronyl nitroxide radical Nit(o-OH)Ph |
Authors: | Yakovenko, A.V., Stroyuk, O.L., Pavlishchuk, V.V. | |
Summary: | Spectral and photochemical properties of ZnO nanocrystal solutions containing free nitronyl nitroxide radical 2-(o-hydroxyphenyl)-4,4,5,5- tetramethylimidazoline-3-oxide-1-oxyl (Nit(o-OH)Ph) were studied. The ZnO photoluminescence quenching by Nit(o-OH)Ph was observed and analysis of the dependences of ZnO photoluminescence intensity on radical concentrations revealed the prevalence of a static mechanism for this process. The changes in spectral properties of colloidal ZnO nanocrystal solutions in the presence of a Nit(o-OH)Ph radical under illumination were studied. The nitronyl nitroxide was found to undergo photoinduced reduction to the corresponding hydroxylamine both via the excited-state interaction with ethanol and capturing of the ZnO conduction band electrons. Photoreduction of the radical was observed under illumination with light of λ > 460 nm in the presence of 4.2 nm ZnO nanocrystals, while no changes took place in the case of larger 4.8 nm ZnO nanocrystals. This pronounced size effect was interpreted in terms of much stronger spatial exciton confinement in the smaller ZnO nanocrystals favouring the irreversible electron transfer from the photoexcited radical. | |
Keywords: | Electron Spin Resonance Spectroscopy; Luminescent Measurements; Molecular Structure; Nanoparticles; Nitrogen Oxides; Photochemical Processes; Zinc Oxide | |
Edition: | Photochemical and Photobiological Sciences | | | 2013,
356-362,English |
041 Effect of the production conditions on the size and magnetic characteristics of iron sulfide Fe3S4 nanoparticles |
Authors: | Vasilenko, I.V., Cador, O., Ouahab, L., Pavlishchuk, V.V. | |
Summary: | It was shown that the reaction of the trinuclear complex [FeFe2O(CH3CO2)6(H2O)3]·2H2O with thiourea in tetraethylene glycol leads to the formation of nanoparticles of thiospinel Fe3S4, the size of which depends on the reaction conditions. It was established that the formed thiospinel particles exhibit superparamagnetic characteristics. It was shown that the size of the nanoparticles has an effect on their magnetic characteristics. | |
Keywords: | nanoparticles; superparamagnetism; thiospinel | |
Edition: | Theoretical and Experimental Chemistry | | | 2010,
312-316,Russian |
041 Synthesis and physical-chemical properties of N-containing nanoporous carbons |
Authors: | Shcherban, N.D., Filonenko, S.M., Yaremov, P.S., Dyadyun, V.S. | |
Summary: | Meso- and microporous nitrogen-containing carbons, characterized by homogeneous meso- (V = 1.00 cm3/g, D = 3.5 nm) and microporous (V up to 0.26 cm3/g, D ≈ 0.5 nm) structure, and the presence of basic groups (up to 1.7 mmol/g) were obtained by matrix and bulk carbonization of sucrose in the presence of melamine or urea. It is shown that obtained N-containing microporous carbons possess good interfacial capacitance (0.21 F/m2) and they are characterized with stability during repeated charge-discharge cycles. Synthesized N-containing nanoporous carbons show higher adsorption of carbon dioxide (up to 6.3 mmol/g at -20 °C) than the samples without nitrogen (up to 3.9 mmol/g at -20 °C) | |
Keywords: | Carbon dioxide; Carbonization; Microporosity; Nitrogen; Urea
Basic groups; Charge-discharge cycle; Interfacial capacitance; Micro-porous carbons; Microporous; Nanoporous carbons; Nitrogen-containing carbons; Physical-chemical properties; Gas adsorption | |
Edition: | Journal of Materials Science | | | 2014,
4354-4362,English |
041 Conditions and features of matrix and bulk carbonization of the organic precursors |
Authors: | Nataliya D. Lysenko, Pavel S. Yaremov, Vladimir G. Ilyin, Mariya V. Ovcharova | |
Summary: | Comparative research of matrix and bulk carbonization
of some organic precursors (sucrose, acetonitrile)
in silica mesoporous materials SBA-15 and KIT-6
was conducted. X-ray diffraction, nitrogen adsorption
analysis, Raman spectroscopy were used for determination
of the structural-sorption characteristics of the obtained
materials. It was shown that the carbon mesoporous
materials CMK-8 obtained in the mesopores of KIT-6 had
higher adsorption characteristics because of features of
three-dimensional cubic structure, larger pore volume and
framework’s wall thickness. It was established that partially
graphitized spatially well-organized carbon materials
were formed as a result of pyrolysis of acetonitrile in the
silica matrices SBA-15 and KIT-6. It was conditioned by
the absence of considerable spatial limitations for growth
of graphite structures on the initial stage of the synthesis
when the pores of the matrix were not filled up with the
organic precursor. Product of bulk carbonization of sucrose
is compact carbon microporous framework with low
sorption characteristics (micropore volume is 0.09 cm3
/g). | |
Keywords: | | |
Edition: | J Mater Sci | | | 2011,
4465–4470,English |
041 Effect of Formation Conditions on the Size, Shape and Spectral Properties of EuS and Pr2S3 Nanoparticles |
Authors: | Selishchev, A.V., Pavlishchuk, V.V. | |
Summary: | A solvothermal method is proposed for the preparation of EuS and Pr2S3 nanoparticles by the reaction of Eu(Stear)3 (Stear = stearate) and NH2Et2[Pr(Ddtc)4] (Ddtc = diethyldithiocarbamate) with excess carbon disulfide. Raising the temperature of this reaction leads to enhanced monodispersity of the EuS nanoparticles, while a decrease in the concentration of the starting reagents leads to a change in the shape of the nanoparticles from cubic to spherical. The band gaps were determined for the EuS and Pr2S3 nanoparticles. No quantum-size effects were found in the optical properties of the EuS and Pr2S3 materials obtained. | |
Keywords: | band gap; europium sulfide; nanosized semiconductor paramagnetics; praseodymium sulfide | |
Edition: | Theoretical and Experimental Chemistry | | | 2014,
39-45,Russian |
The events in the framework of the project |
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041 2.1. Physics and chemistry of nanomaterials and nanostructures Purpose: Expected results:Issue of new types of products: methods, theories Stage 1:Синтез нанорозмірних магнітних і магнітно-люмінесцентних частинок. Направлений синтез та структурносорбційні властивості вуглецевих нанопористих матеріалів. Розробка методів синтезу композитних матеріалів на основі поліоксометалатів, що містять нанокластери благородних металів, та встановлення чинників, що дозволяють контролювати їх будову. Stage 2:Розробка методик отримання магнітно-люмінесцентних нанокомпозитів. Модифікування та активація наноструктурованих вуглецевих матеріалів. Розробка шляхів отримання метал-органічних каркасів, допованих нанокластерами срібла, золота і паладію. Stage 3:Оптимізація методик отримання магнітно-люмінесцентних нанокомпозитів. Дослідження впливу хімічної природи вихідних органічних речовин на склад, структуру та фізико-хімічні властивості ВНМ. Отримання нанокомпозитів на основі метал-органічних каркасів та наночастинок напівпровідників. Stage 4:Встановлення впливу хімічної будови магнітних наночастинок, люмінесцентних сполук, вільних радикалів на магнітні та люмінесцентні властивості нанокомпозитів Матричний синтез та фізико-хімічні властивості вуглецевих мікропористих матеріалів Встановлення структури, складу і морфології нанокомпозитів та пошук шляхів керування даними параметрами. Stage 5:Порівняльний аналіз люмінесцентних та магнітних властивостей нанокомпозитів. Можливості та умови направленого регулювання природи вуглецевого каркасу, визначення особливостей застосування синтезованих матеріалів Дослідження взаємозв’язків між будовою нанокомпозитів їх окисно-відновними, каталітичними, фотохімічними, оптичними і електричними властивостями. Розробка рекомендацій стосовно практичного використання отриманих матеріалів.
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